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100 INSTRUMENTS FOE FILLING.

the bulb is formed, it is usually cut with a sharp-
edged file.

Fig. 8.

Of these drills, Fig. 8 represents a bur of a spher-

ical form. Fig. 9 is cone-shaped, which may have
Fig. 9.

various degrees of bevel, terminating in a sharp point.
Fig. 10 is of a cylindrical form, cut upon the sides
and end. Fig. 11. is in the form of a wheel, cut upon
Fig. 10.

the edge only, or upon both the edge and the end.
The cutting upon all of these should be very regular
and uniform. This should be made by machinery,

though it is usually done by hand. Of these instru-
Fig. 11.

ments, there should be a variety in size, the smallest